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Seminars

Check this page regularly for the Earth Sciences Seminar Series schedule as well as Special Seminars hosted by the Department.Microbial controls on biogeochemical carbon cycling in marine sediments

Rockfest Seminar Schedule

ESSSLOGO

ES Seminars Schedule 2020 – 2021 are being presented online. 

Check each individual seminar for details on how to join – times and days will vary, including the time zones!

 

 

23-Sep-21

12:00PM

Eastern Time

Dr Sandra Taylor

EMSL PNNL

Resolving crystal growth and incorporation mechanisms at the nanoscale using atom probe tomography”

Abstract: 

Atom probe tomography (APT) is an analytical technique with the unique capability to map the chemical composition of materials in three-dimensions with sub-nanometer resolution. It has only recently gained traction within the geosciences within the last decade, but has proven to be valuable in connecting observations within geomaterials at the macroscopic scale to atomic-level phenomena. Here, I discuss the emerging applications for APT within in the geosciences, particularly showcasing its use to unravel crystal growth and incorporation mechanisms. In one example, direct observation of hydrated defects within natural specimens is enabled through the use of APT, in turn providing unique insight into modes of incorporation for water in nominally anhydrous minerals. In another example, mineral recrystallization pathways and mechanisms are explored through the development of novel isotope tracer experiments. Together, these studies provide new insight into crystal growth and incorporation mechanisms at the atomic-scale.

Join Zoom Meeting

https://utoronto.zoom.us/j/81761652047

Meeting ID: 817 6165 2047

Passcode: 898050

One tap mobile

+15873281099,,81761652047#,,,,*898050# Canada

+16132093054,,81761652047#,,,,*898050# Canada

 

07-Oct-21

 

12:00PM

Eastern Time

Catherine Macris

Purdue University
Mineral Society of America Distinguished Lecturer

 
Join Zoom Meeting
 
Meeting ID: 821 5996 1908
Passcode: 130289
 
Join by Skype for Business

21-Oct-21

 

     

28-Oct-21

12:00PM

Eastern Time

D.A Kellett

“Thermochronological record of the northern Canadian Shield”

Geological Survey of Canada,
Dartmouth, Nova Scotia, Canada

In the 1960s, the Geological Survey of Canada (GSC) published a series of reports that first delineated the structural provinces and orogenies of the Canadian Shield, based on an extensive K-Ar dataset (Stockwell 1964 and references therein). Today, we rely primarily on the U-Pb method for bedrock mapping studies in the Shield, and the K-Ar method has been largely superseded by the Ar/Ar method. Ar/Ar ages remain essential data for igneous and metamorphic thermochronological studies, but the available Ar/Ar dataset for the Canadian Shield has never approached the coverage of earlier K-Ar  work.

Recent bedrock mapping in several regions of the northern Canadian Shield under the GSC’s 2013-2020 Geomapping for Energy and Minerals program included the acquisition of several new Ar/Ar datasets. These data, combined with other recent Ar/Ar studies, have greatly expanded the cooling history record for the northern Canadian Shield. In this talk, I will review the available Ar/Ar cooling ages for hornblende, muscovite and biotite. These three minerals record the temperature-time evolution of rocks through the midcrust as they have transitioned from dynamic tectonism during orogenesis to tectonic quiescence. In exploring the data, I will discuss the history of K-Ar and Ar/Ar methods, their limitations and interpretations, and ways in which we might relate regional thermochronological datasets such as this to geodynamic processes.

 

Stockwell, C.H., 1964. Fourth report on structural provinces, orogenies, and time-classification of rocks of the Canadian Precambrian Shield. Geological Survey of Canada, Paper 64-17, p. 1-29.

 

 

04-Nov-21

12:00PM

Eastern Time

J.Kotkova

Are metamorphic microdiamonds from Bohemia forever?

Jana Kotková
Czech Geological Survey, Prague, and Masaryk University, Brno, Czech Republic

Metamorphic diamonds occurring in ultrahigh-pressure metamorphic (UHPM) terranes provide evidence for a deep subduction of continental crust in convergent orogens and its exhumation to the Earth’s surface.  Microdiamonds are enclosed in peak metamorphic phases, i.e., garnet and kyanite, as well as zircon. Gem-quality octahedral diamond forms are common in Bohemia, Central Europe, while cubo-octahedra are characteristic of other UHPM terranes. The octahedral diamond features (morphology, resorption, carbon isotope composition), combined with P-T constraints from the metasedimentary host rocks, provide important insights into nucleation and growth mechanisms of microdiamonds worldwide. In addition, the Bohemian microdiamonds are well-preserved, without any surface graphitization, which has been reported elsewhere. Examination if and why they are “forever” is a target of our present study.

 

 

 

18-Nov-21

 

     
         

20-Jan-21

 

     

03-Feb-21

 

     

17-Feb-21

 

     

03-Mar-21

 

     

17-Mar-21

 

     

 

17 September 2020

Zoom meeting at noon Eastern Time

Laura Waters
New Mexico Institute of Technology

Mineralogical Society of America’s distinguished lecturer

Why doesn’t continental crust evolve to its fullest potential?

Register for this Seminar here: https://us02web.zoom.us/meeting/register/tZIqceCgqjosG9Ax8rCSKwwgXRUJ5lfJj0m9

01 October 2020  Noon

John Geissman
University of Texas at Dallas

 

  TBA

22 October 2020

*Special Seminar*

Noon

Judith Kinnard

 

 

The Bushveld Complex, South Aftrica – The First Hundred Years

A tribute to Tony Naldrett

 

05 November 2020

 

 Noon

Philips Ahzegbobor Aizebeokhai

 
Near-surface characterisation using geoelectrical resistivity method: field examples, challenges and opportunities
 

19 November 2020

 

Mads Huuse

 

Glaciation of the North Sea Basin

14 January 2021

Noon

Sarah Hirschorn

Nuclear Waste Management Organization

Characterizing Sites for a Deep Geological Repository for Canada’s Used Nuclear Fuel

28 January 2021

Noon

Stephanie Olsen

Purdue University

Oxygenic Photosynthesis on an Anoxic Earth: Implications for Exoplanet Life Detection

11 February 2021

 

Zachary E. Ross

California Institute of Technology

3D fault architecture controls the dynamism of earthquake swarms

Past Seminars:

ES Seminars Schedule 2019 – 2020

Time: Noon (unless otherwise stated)

Place: ES2093 “Seminar Room”

12 September 2019 Noon Sarah Gleeson
GFZ Helmholtz Centre Potsdam
Dan Gregory SEDEX Diagenesis, Sulfur, and Giant Zn Deposits
03 October 2019  Noon John Jamieson
Memorial University
Melissa Anderson VHMS Ore-forming processes on the seafloor – understanding the difference between black smoker vent fields and the formation of metal-rich massive sulfide mineral deposits

16 October 2019

*Special Geophysics Seminar*

Noon

Marion Jegen-Kulcsar

 

  Geophysics

17 October 2019

Joubin James Lecturer

 Noon

Andrei Swidinsky
Colorado School of MInes

Qinya Liu Geophysics From the seafloor to the solar wind: Applied geophysics, electromagnetic fields and 21st century problems

23 October 2019
*Special Geophysics Seminar*

***4:00pm***

Heloise Lynn
Lynn Inc.

 

SEG – Society of Exploration Geophysicists 2019 Honorary Lecturer

Azimuthal P-P seismic measurements:  Past, present, and future

5 November 2019
*Special Geophysics Seminar*

 Noon

Alastair McClymont
Advisian, Calgary,
Alberta

Charly Bank

 

The Forgotten Holocaust – Geophysical Investigations at World War 2 Extermination Sites in Lithuania
14 November 2019  Noon Kim Lau Dan Gregory U istotope Tracking Anoxia in Ancient Oceans: Insights from uranium isotopes

21 November 2019

Joubin James Lecture

Noon

Alberto Vitale Brovarone
University of Turin

Xu Chu  

Abiotic hydrocarbons on Earth: controversial theories, serpentinization, and new perspectives from subduction zones

 

28 November 2019  Noon Alison Malcolm  Qinya Lui Seismic

Using Lab and Numerical Experiments to Better Understand the Recovery of Rocks After Strong Earthquakes

 SPRING TERM
 09 January 2020  Noon Verena Heuer  Barbara Sherwood Lollar IODP deep biosphere

Exploring the limits of Earth’s habitability by scientific ocean drilling: The impact of temperature on microbial life and carbon flow in deep sub-seafloor sediments

 23 January 2020  Noon Erasmus Oware  Charly Bank geophysics

Agricultural Geophysics: New Opportunities in applications of Geophysics

06 February 2020

 Noon Eileen van der Flier-Keller   Charly Bank geoscience education Empowering students to Communicate Science: the SFU experience
27 February 2020  Noon Britta Jensen Sarah Finkelstein quaternary

Extending the reach of volcanic ash: cryptotephra in eastern North America

12 March 2020  Noon John Geissman
CANCELLED
Sandra Kamo   Paleomagnetism and Magnetostratigraphy of Upper Permian to Lower Triassic (?) Beaufort Group Strata in the Karoo Basin, South Africa: Where is the Permian-Triassic Boundary and Can We “See Through” the Effects of Karoo Large Igneous Province Magmatism? (along with some other musings)
20 March 2020  Noon Laura Waters
CANCELLED
Dan Gregory   Why doesn’t continental crust evolve to its fullest potential?

Other Seminars

Due to COVID-19 restrictions the seminar room at Earth Sciences is closed and the groups listed below ay have mhave changed their meetings to online.

2019 – 2020 Geophysics Seminar Series

KEGS Seminars are held in the Seminar Room – ES2093 during the regular term

TGDG GTA events

Walker Mineralogical Club meets in ES2093 monthly.